What is the meaning of "Qinglong" in Feng Shui? What is the ancient name of Feng Shui?

For example, heaven; I don't understand, tunnel. Originally, I looked up at the sky and looked down at geography.

In China folk, Kanyu is called Feng Shui.

The meaning of "Qinglong" in geomantic omen is:

Refers to the mountain shape on the left side of the cave field. Guo Pu's "Buried Sutra": "When the husband is buried, the left is the dragon."

Later, it also refers to the running water on the left side of Yangzhai.